The first Thor movie is the one example of an MCU movie that I felt looked cheap and was negatively impacted by the limitations of what the studio could do at that time.
Especially the disposable small town in the desert, but there were basically three sets: the frost giant world, the town, and then Asgard. There was the throne room and Heimdall's chamber in Asgard, but anyway. Not of it was really very convincing from a visual standpoint.
It wasn't until the first Guardians movie that the MCU reached the point where the studio was able to do this kind of cosmic epic on a grand scale. The finale of this movie absolutely worked for me. Incredibly cool.